The Cardinals acquired Montgomery on Tuesday in exchange for Harrison Bader (foot), Jack Curry of YES Network reports.
Montgomery had been a fixture in New York's rotation, but the team decided that adding a defense-first center fielder in Bader was the greater priority heading into the stretch run of the season. As for St. Louis, the addition of the experienced southpaw will bolster a rotation that has been hit by injuries, and his numbers could be even better while he makes the move from the AL East to the NL Central. Montgomery submitted a 3.69 ERA and 1.10 WHIP while striking out 97 in 114.2 innings with New York prior to the trade.